/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package cn.edu.seu.cose.hobbysharing.servlet;

import cn.edu.seu.cose.hobbysharing.dao.UserDao;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Xiang
 */
@WebServlet(name = "IDGenerator", urlPatterns = {"/getid"})
public class IDGenerator extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/plain;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            String user_display_name= request.getParameter("udn");
            String user_blog_url= request.getParameter("ubu");
            String user_email= request.getParameter("ue");
            String user_home_page= request.getParameter("uhp");
            UserDao dao = new UserDao();         
            if(user_display_name==null|| user_blog_url==null||user_email==null){
                response.sendError(400);
                return;
            }
            if(user_home_page==null){
                if(dao.existUrl(user_blog_url)){
                    out.print(dao.getUuidByUserBlogUrl(user_blog_url));
                }else{
                    String ID = dao.addUser(user_display_name, user_blog_url, user_email);
                    out.print(ID);
                }
            }else{
                if(dao.existUrl(user_blog_url)){
                    out.print(dao.getUuidByUserBlogUrl(user_blog_url));
                }else{
                    String ID = dao.addUser(user_display_name, user_blog_url, user_email, user_home_page);        
                    out.print(ID);
                }
            }
        }catch(SQLException ex){
            response.sendError(500, ex.getMessage());
        }         
        finally {            
            out.close();
        }
    }
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
